Appendix I. Fault State Processing; Initiate Fault State From The Host - GE Baker Hughes Masoneilan SVI FF Installation And Operation Manual

Appendix I. Fault State Processing

This section explains how the fault state is processed in the SVI FF.
NOTE
The fault state can be initiated from multiple sources:

"Initiate Fault State from the Host"

"Fault State Conditions Detected by AO Block" on page 204
"Fault State Conditions Detected by Transducer Block" on page 204
"Fault State Condition is Detected and Processed by the Position Control Hardware and
Software" on page 205
Initiate Fault State from the Host
The host may drive the entire device to fault state by setting the SET_FSTATE parameter to SET.
The Fault State related I/O option (IO_OPTS) determines the reaction of the Analog Output or
Discrete Output function block - whether the action is simply to hold, or to move to FSTATE_VAL.
If Analog Output block is in AUTO, CAS or RCAS mode and if I/O Option IO_OPTS bit 6 (Fault State
to value) is:
Set, the OUT parameter of the block is set to the value defined in FSTATE_VAL. FF
specification recommends that FSTATE_VAL value is close to the de-energized position.
NOT set, the OUT parameter of the block remains unchanged - the valve keeps the
position set before the fault state is initiated.
The Transducer block then follows the setpoint received from the output block.
When the CLEAR_FSTATE parameter is set to CLEAR, the block normal processing is restored.
© 2019 Baker Hughes, a GE company, LLC. All rights reserved.
The discussion that follows uses the AO block as an example.
However this can occur through the DO block as well.
Masoneilan SVI FF Instruction Manual
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